74AHCT123APW,118

Overview

The Nexperia 74AHCT123APW,118 is a dual retriggerable monostable multivibrator with reset. It operates within a supply voltage range of 4.5 V to 5.5 V and accepts TTL-level inputs. The device features Schmitt-trigger action on all inputs for high noise immunity and overvoltage tolerance up to 5.5 V. It provides active HIGH (nQ) and active LOW (nQ) outputs. Pulse width is programmed via external components connected to the nREXT/CEXT pins. The component is housed in a TSSOP16 package (SOT403-1) and supports an operating temperature range from -40 °C to +125 °C.

Feature Summary

• Dual retriggerable monostable multivibrator architecture with direct reset functionality
• TTL-compatible input levels with Schmitt-trigger action on all inputs
• Overvoltage tolerant inputs allowing operation in mixed-voltage environments
• Provides complementary active HIGH and active LOW output signals

Applications

• Timing pulse generation and shaping
• Debouncing of mechanical switches
• Pulse width modulation circuits
• Frequency division applications

Procurement Notes

Verify that the ordering suffix ',118' corresponds to the specified TSSOP16 plastic thin shrink small outline package (SOT403-1). Confirm the logic family designation 'AHCT' matches the required TTL input voltage thresholds for the target system design. Ensure the ambient temperature specifications align with the operational requirements of the final application environment.

Selection Notes

Select this component when TTL logic compatibility is required alongside CMOS performance characteristics. The AHCT series ensures proper interface with standard TTL devices while maintaining low power consumption. Verify that the external timing components selected for REXT and CEXT fall within the recommended operating conditions to ensure accurate pulse width generation across the full temperature range.

Part Context

This part belongs to the Nexperia 74AHC(A)HCT123A family of dual retriggerable monostable multivibrators. The specific APW variant utilizes the TSSOP16 surface-mount package. This family allows for flexible pulse duration control through external resistor and capacitor selection, supporting duty factors up to 100% via retriggering capabilities.

Replacement Considerations

Cross-reference with other manufacturers offering equivalent dual monostable multivibrators in TSSOP16 packages. Verify pinout compatibility and electrical parameter alignment before substitution.

FAQ

How is the output pulse width determined?

The basic output pulse width is programmed by selecting external components connected to the REXT and CEXT pins.

Can the output pulse be extended after triggering?

Yes, the device is retriggerable; applying another trigger signal to either edge-triggered input extends the output pulse period.

What happens if the reset input is activated?

A LOW-going edge on the direct reset input terminates the output pulse immediately.